update readme to show shifu's value with a diagram

[saiyan86]

What this PR does / why we need it:

This PR updates the README file to show shifu's value.

Will this PR make the community happier?

Yes. This will make it much easier to understand why developers need to choose shifu.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

How is this PR tested

• unit test
• e2e test
• other (please specify)

Special notes for your reviewer:

Release note:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.49%. Comparing base (db47f77) to head (983a108).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1056      +/-   ##
==========================================
+ Coverage   33.43%   33.49%   +0.06%     
==========================================
  Files          55       55              
  Lines        4806     4806              
==========================================
+ Hits         1607     1610       +3     
+ Misses       3059     3057       -2     
+ Partials      140      139       -1     

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[rhoninl]

LGTM

[rhoninl]

LGTM